Electron-discharge device



Dec.

. R. F. TRIMBLE ELECTRON DISCHARGE DEVICE Filed Oct. 4, 1918 //7ven/"ak:

Russel! F Tr/mb/e Patented Dec. 15, 1925.

UNITED STATES PATENT OFFICE.

RUSSELL F. TRIMBLE, OI ELIZABETH, NEW JERSEY, ASSIGNOR TO WESTERN ELEC-TRIO COMPANY, INCORPORATED, OF NEW YORK, N. Y., A CORPORATION OF NEWYORK.

ELECTRON-DISCHARGE DEVICE.

Application filed October 4, 1918. Serial No. 256,825.

To all whom it may concern-.-

Be it known that I, RUssELL F. TRIMBLE, a citizen of the United States,residing at Elizabeth, in the county of Union, State of New Jersey, haveinvented certain new anduseful Improvements'in Illectron-DischargeDevices, of which the following is a full, clear, concise, and exactdescription.

This invention relates to electron discharge devices and pertainsespecially to vacuum tubes of the audion type.

An object of this invention is a vacuum tube wherein the possibility ofbreakage of the-glass supporting structure for the electrodes, ismaterially reduced.

To attain this object the glass arbor from which the electrodes are suported, instead of being a continuation o the press, is anchored to thetubular portion of the stem. The anchoring of the arbor to the stemreduces the strain on the press and provides a connection capable ofsustaining severe jarring without breaking.

For further details of the invention, reference ma be made to thedrawings, in which Fig. 1 s owsv in perspective a vacuum tube whichillustrates the preferred form of; mounting, and Fig. 2 is an elevationof the arrangement shown in Fig.1.

Referrin in detail to the drawings, the vacuum tu%e 1 contains within ittwo V- shaped filamentary cathodes 2, a pair of grid aces 3 and 4, and apair of plate or anode surfaces 5 and 6. This invention is notrestricted to anyparticular manner of connecting these electrodes, whichmay, however,'be connected as shown in the patent to Arnold No.1,129,942, March 2,1915.

The vacuum tube 1 is provided with the usual inwardly projecting tubularportion 7, the top 8 of whichhas been compressed to form a so-calledpress in which the lead wires are sealed. At one side of the tubularportion 7, at the point 9, is anchored an arbor 10, from which extendthe supporting wires 11, 12, 13 and 14 which are connected at one end tothe arbor and at their outer ends to the plate electrode 6. From the topof the arbor extends supporting wires 15 and 16 for positioning thegrid, and the wires 17 and 18 for supporting the filament. The arbor isanchored to the tubular portion 7 at a point equidistant from the endsof the press 8, and issues therefrom substantially radially, after whichit is bent to parallelism with the axis of the tubular portion wherebyit is located outside of the area bounded by the electrodes, and lyingbeyond the direct line of action between the electrodes, it does notinterfere with the flow and control of space current therebetween.

- The plate 5 is supported from the plate 6 by four wire arms, only twoof which, 19 and 20, are shown, the other two being lo cated at theother side of the plates. These plates are provided with upturned edges,as shown, to which the wires 19, 20 are welded. Lead wire 21 is providedfor the plates.

The bottom of the grid is supported by wires 22 and 23, anchored to thepress 8. Electrical connection to the grid is provided by the lead 24.Leads 25 and 26 connect with the filament, the former being connected tothe ends of the filament by way of the stiff wires 27, 28, which aresealed in the press 8 and which position the ends of the filament. Themiddle of the filament is connected to the wire 26 by'the supportingwire 29. This arrangement serves to connect the two halves of thefilament in parallel. Y

The arbor 10 is anchored to the tubular portion at'such a point that theplanes of all electrodes are substantially parallel to the plane of thepress 8, which brings the electrodes into such positions that the leadwires may be readily connected thereto. The filament or'cathode isfurthermore substantially in the plane of the pressand the otherelectrode surfaces are symmetrically disposed about it.

\Vha't is claimed is:

1. In an electron discharge device, a containing vessel comprising astem terminating in a flat press, a plurality of leading-in wires sealedin said ress and lying substantially in the same p ane, an arboranchored to said stem at a point removed from said press, and aplurality of electrodes supported cated outside of the space bounded bysaid electrodes and outside of the plane of said leading-in Wires, saidarbor, press and sup porting connections thereto comprising substantialy the only means for supporting said electrodes.

3. In an electron discharge device, a containing vessel comprising areentrant stem terminating in a press, an. arbor anchored to said stem'at a point removed from said press, said arbor having its major portionarallel to the axis of said stem and offset rom the surface of saidstem, a plurality of electrodes supported by said arbor, and

lead Wires for said electrodes sealed in said 1 RUSSELL F. TRIMBLE.

